I know in my cage I can tell when its time for brakes by the feel of the brake pedal or when I start hearing the squealing noise (which by then it's usually too late to save the rotors). But how do you know with a bike? To me the brake pads are so thin even when brand spanking new that it's going to be hard to visually check them. How do you all know when its time for a brake job? Do you feel a difference in the brake lever? Or do you change them out at a certain mileage to be on the safe side. Brakes are the most important safety feature on a bike or car, don't want to neglect them. Not going to attempt to do the work myself, as I just figured out how to do disc brakes on a car. I certainly don't have the patience to do drums. I do believe my bikes have the drums on the back. Do the rotors and drums get turned like in cars? Or are they just replaced?